Oil layer-section oil casing pipe for exploiting thick oil by method of combustion drive and production method thereof

Abstract

The invention provides an oil layer-section oil casing pipe for exploiting thick oil by a method of combustion drive, which comprises the following chemical components in percentage by weight: 0.06-0.14% of C, 0.20-0.50% of Si, 0.20-0.70% of Mn, P which is greater than or equal to 0 and less than or equal to 0.015, S which is greater than or equal to 0 and less than or equal to 0.010, 8.0-10% of Cr, 0.80-1.20% of Mo, Al which is greater than or equal to 0 and less than or equal to 0.015wt, Cu which is greater than or equal to 0 and less than or equal to 0.15wt, Ni which is greater than or equal to 0 and less than or equal to 0.40, and the balance of Fe. The invention also provides a production method of the oil layer-section oil casing pipe for exploiting thick oil by the method of combustion drive. The invention has the effect that the casing pipe produced according to the steel grade and the production technology has the characteristics that the yield strength of the material of thecasing pipe reaches more than 580MPa at the environmental temperature of 550 DEG C, the endurance strength of 100000 hours at 650 DEG C reaches more than 70MPa, and the average corrosion rate of the casing pipe is lower than 0.32mm / year under the environmental conditions that the temperature is 150 DEG C, the CO2 partial pressure is 1.5MPa and the flow rate is 1.5m / s, thereby completely meeting the use requirements of oil layer-section casing pipes of casing pipe columns at the innermost layers of gas-injection wells and production wells for exploiting thick oil by the method of combustion drive.

Description

technical field [0001] The invention relates to a method for producing an oil casing, in particular to an oil casing for an oil layer section used in the exploitation of heavy oil by a fire flooding method and a production method thereof. Background technique [0002] Heavy oil is a kind of heavy crude oil with high viscosity and poor fluidity, which is difficult to recover by conventional methods. Strong temperature sensitivity is a major feature of heavy oil. People use this feature to thermally recover heavy oil, which is to adopt a thermal recovery method that increases the temperature of the crude oil reservoir to improve the fluidity of the crude oil, so that it is easy to recover from the formation. crude. [0003] There are many methods of thermal recovery of heavy oil. Among them, special methods are used to ignite the heavy oil in the formation, raise the temperature of the reservoir, reduce the viscosity of the heavy oil, and improve its fluidity, so as to achiev...

AI Technical Summary

Problems solved by technology

The existing API casing is not suitable for heavy oil thermal recovery wells due to its poor heat resistance

Existing ordinary heavy oil thermal recovery well casings are mainly used for steam injection thermal recovery wells. The operating temperature is generally around 350°C, and their oxidation resistance and corrosion resistance are poor. Therefore, they are not suitable for fire flooding. In order to exploit heavy oil using this method, it is necessary to design and develop special casings in a targeted manner.